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Progress in Chemistry 2004, Vol. 16 Issue (01): 99- Previous Articles   Next Articles

• Review •

Improve the Quantum Efficiency in O/PLED Using Triplet Exciton*

Zhen Hongyu;Yang Wei**;Zhu Weiguo;Cao Yong   

  1. (Institute of Optoelectronic Materials & Devices, South China University of Technology, Guangzhou 510640, China)
  • Received: Revised: Online: Published:
  • Contact: Yang We
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The external quantum efficiency in organic and polymer LED is much lower than theoretical limit. One of the important reasons is that triplet excitons which account for 75% of the excitons are not used in radiative recombina-tion. Recently, significant progress has been made in utilization of the electrophosphorescence in organic and polymer light emitting devices. Beginning with the luminescence mechanism of triplet excitons, recent progress in highly efficient light emitting devices using phosphorescent sensitizer is reviewed. Future direction in this research field is also dis-cussed.
Key words: electroluminescence, triplet, electrophosphorescence, 0/PLED

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